// Cells and their vertices.
#0={0}
#1={1,4,6}
#2={2,5,7}
#3={3,8}
#4={9,14,16}
#5={10,13,18}
#6={11,17}
#7={12,20}
#8={15}
#9={19}

// Induced graph on cells.
#0:.
#1:->#0.
#2:->#0.
#3:->#0,#1,#2.
#4:->#1,#2,#3.
#5:->#1,#2,#3.
#6:->#1.
#7:->#2.
#8:->#4,#5,#6.
#9:->#4,#5,#7.

// Individual cells.
// cell #0:
0[0]: {}

// cell #1:
0[1]: {2} --> 1,2
1[4]: {3} --> 0
2[6]: {1} --> 0

// cell #2:
0[2]: {2} --> 1,2
1[5]: {3} --> 0
2[7]: {1} --> 0

// cell #3:
0[3]: {1,3} --> 1
1[8]: {2} --> 0

// cell #4:
0[9]: {2,3} --> 2
1[14]: {1,2} --> 2
2[16]: {1,3} --> 0,1

// cell #5:
0[10]: {2,3} --> 2
1[13]: {1,2} --> 2
2[18]: {1,3} --> 0,1

// cell #6:
0[11]: {1,3} --> 1
1[17]: {2} --> 0

// cell #7:
0[12]: {1,3} --> 1
1[20]: {2} --> 0

// cell #8:
0[15]: {1,2,3}

// cell #9:
0[19]: {1,2,3}